After saying he would consider his future for up to a year, Brawn is quoted as saying he is retired from Formula One.
"What they didn't realise when I was invited here was they had a scoop because the world's press was trying to find out if I was retiring or not," the Briton told the newspaper.
"This is the busiest time of the year for Formula One and I said I would come along and open the River Dee.
"If they had put two and two together they would have realised I was definitely retiring."
The 59-year-old is widely credited as a key figure behind Michael Schumacher's seven world titles at Benetton and Ferrari and also found success with his self-titled team in 2009, when Jenson Button won the world championship.
"I'm retiring - it's not tongue in cheek," Brawn asserted.
"I'm going to take a year to enjoy the fishing and then see what life brings. I'm looking forward to it but I've got no other plans.
Two months ago Brawn told Reuters Television, while attending a film premiere, that he had made no decision about what he wanted to do next.
"I have no idea. I will genuinely see how things pan out in the next six to 12 months and make a decision," he said.
At that time he was not ruling out a return to Formula One: "I will take some time off now and reflect on things, see if the juices start flowing again and next summer make a decision if there are any opportunities or there are things that I want to do or people offer me things to do," he said.